Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Defeat of the Romans in Pontus at Ziela
What Triarius had foreseen, occurred. In spite of the stoutest resistance the wing which the king commanded in person broke the Roman line and huddled the infantry together into a clayey ravine, where it could make neither a forward nor a lateral movement and was cut to pieces without pity. The king indeed was dangerously wounded by a Roman centurion, who sacrificed his life for it; but the defeat was not the less complete. The Roman camp was taken; the flower of the infantry, and almost all the staff and subaltern officers, strewed the ground; the dead were left lying unburied on the field of battle, and, when Lucullus arrived on the right bank of the Euphrates, he learned the defeat not from his own soldiers, but through the reports of the natives.
Mutiny of the Soldiers
Along with this defeat came the outbreak of the military conspiracy. At this very time news arrived from Rome that the people had resolved to grant a discharge to the soldiers whose legal term of service had expired, to wit, to the Fimbrians, and to entrust the chief command in Pontus and Bithynia to one of the consuls of the current year: the successor of Lucullus, the consul Manius Acilius Glabrio, had already landed in Asia Minor.
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Reference address : https://www.ellopos.net/elpenor/rome/5-02-rule-sullan-restoration.asp?pg=59